Regular maintenance of vacuum pump unit

With the rapid development of the national economy, enterprises and units put forward higher and higher requirements for the safe and reliable operation of vacuum pump units. In order to achieve this requirement, we must do a good job in the regular preventive maintenance of vacuum pump unit. 

1. According to the scheduled time interval to the site for machine repair.

2. Repair or replace the equipment before major failure occurs. If properly arranged, the maintenance cost of this scheme will be less than that of post accident maintenance.

3. When the vacuum pump unit does not need to work continuously, it is obvious that the technical personnel with rich maintenance experience can carry out regular preventive maintenance.

4. Otherwise, it will cause unnecessary maintenance. There will also be a series of problems, such as the complete machine being disassembled, repeated secondary installation leading to the decline of installation accuracy and so on.

Regular preventive maintenance of vacuum pump unit is the key to its work efficiency. It can make the vacuum pump unit in a stable working state for a long time, reduce energy consumption and prolong its service life.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Debugging method of rotary fan

After the rotary fan is installed in place, first remove the air inlet filter and pour about 30ml oil into the main engine to make the engine oil evenly distributed in the main engine. Rotate the main pulley by hand to make the engine oil evenly lubricate the inner wall of the fan.

Before starting the rotary fan, please confirm whether the V-belt is loose properly. If it is too loose, please adjust it. Make sure that the relief valve is set at the specified pressure position. During commissioning, the exhaust valve can be adjusted manually to increase the opening pressure, adjust the safety valve and open it immediately. Before starting the rotary fan, the sewage treatment tank must be filled with water before the rotary fan can be operated. Otherwise, if there is no pressure at the outlet of the rotary fan, the rotary fan will not be lubricated. Turn on the power fan and confirm that the rotation direction of the rotary fan is consistent with the rotation mark direction. In case of inconsistency, disconnect the power supply immediately and adjust the motor wiring.

Observe whether there is pressure indication on the pressure gauge, observe the oil dripping from the nozzle, observe whether there is oil flow in the transparent oil return pipe, check whether all parts of the motor and fan work normally, whether the temperature is normal, and whether there is abnormal sound.

Vacuum Pump Used In Pharmaceutical Chemical Instrument

Roots Vacuum Pump Applied In Southeast Asia Chemical Plant

Rotary Vane Vacuum Pump For Frequency Converter

Scroll vacuum pump

The research of vortex vacuum pump began in the late 1980s. A vertical self rotating oil lubricated scroll water ring vacuum pump with pumping speed of 200L / min was developed. Compared with revolution type vortex vacuum pump, the radial clearance of the pump has the advantages of easy sealing and control. Compared with the vane pump, the scroll pump has higher volumetric efficiency, and the vibration and noise levels in the pump are reduced. In addition, due to its more compact structure, the weight and volume of the machine are reduced by 12% and 40% respectively. The research shows the high efficiency of the scroll vacuum pump, and puts forward the effective methods of how to eliminate the clearance volume and control the clearance. With the continuous expansion of the application of vortex vacuum pump in semiconductor industry, people began to devote themselves to the research of dry scroll vacuum pump. The difference between dry scroll vacuum pump and oil lubricated scroll vacuum pump is that there is no oil and liquid in the pump cavity. Therefore, to solve the problem of sealing and cooling in the pump is the key to the research of dry scroll vacuum pump. 

The ultimate pressure that the pump can reach is 5 × 10 - 3T. It uses water cooling method to solve the lubrication and cooling problems of various parts in the pump. The research shows the feasibility of the dry scroll vacuum pump, and effectively solves the problems such as the contact caused by the thermal deformation of the moving disk and the vibration caused by the centrifugal force. Although the cooling problem of dry scroll vacuum pump can be effectively solved by using water cooling method, the structure of the cooling water circuit is more complicated. Two cooling fans are installed on the main shaft, which are respectively located at the ends of the two stationary disks. When the main shaft rotates, the fans rotate together to achieve the cooling effect on the vortex disk. At the same time, it adopts a semi closed structure to solve the cooling problem of the motor. The pump adopts a totally enclosed structure, the vortex disk is a single vortex ring structure, and the cooling fan is installed at the end of the static disk.


Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Dynamic equilibrium equation of vacuum system

In general, the design and calculation of vacuum system is based on the total outgassing quantity Q, and according to the characteristics of metallurgical process, the nature of gas source should also be taken as the basis of design. That is to say, the quality and quantity of gas source should be combined to determine the design scheme. 

In the process of vacuum smelting, the gas source is characterized by high temperature and a large amount of dust, oxygen, hydrogen and sometimes corrosive or toxic gases. Therefore, in some systems, it is usually equipped with dust remover, filter, chemical assembly and low pressure, and sometimes the pipeline needs water cooling. Some corrosive gases, such as the process of haimianqin, emit hydrogen chloride. The corrosion of dust on the mechanical pump oil and pump body parts is very serious, so that the pump oil has to be replaced frequently. According to the process requirements, the vacuum system composed of roots pump and water ring pump has good effect. In addition, there is the problem of discharging steam. If the vacuum system starts to be evacuated from the atmosphere, it starts to deflate at 1 ~ 10-1 Torr, while when 10-1 ~ 10-2 Torr, the surface mainly deflates water vapor in the air. This problem can be partly solved by pneumatic pump. In the ultra-high vacuum system, there is more hydrogen in the residual gas, so zirconium aluminum suction pump can also be selected.

The vacuum system can be brought into full play by selecting appropriate pumping equipment according to different gas source properties.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Cooler for vacuum pump

Cooler for vacuum pump

In fact, for the work of the vacuum pump, we need to know that when the cooling water volume and temperature of the cooler are insufficient, the cooling water temperature will increase, leading to the reduction of the cooling efficiency. If the excessive temperature is not spread in time, the working fluid temperature will increase, affecting the output. According to our work experience, it is an effective preventive measure to measure the cooling water temperature of the equipment regularly and timely, which can effectively judge the internal state of the water ring vacuum pump and provide reference for the maintenance personnel.

Pay attention to keep the cooler clean at the same time. The vacuum pump adopts plate cooler, and the cooling water is supplied by industrial water, which is affected by different industrial water quality and has different influence on the equipment. When the industrial water quality is poor, it will lead to the fouling of plate cooler, reduce the circulation area of cooling water, thus affecting the overall flow and flow rate of water, resulting in the temperature rise of working fluid. Therefore, the cleaning of the cooler and cooler is directly related to the temperature of the working fluid of the vacuum pump.
VACUUM FURNACE

industrial vacuum pumps,vacuum furnaces

Heat treatment equipment

Light multistage centrifugal pump

Light multistage centrifugal pump

The sucked gas in the water ring vacuum pump enters the space between the water ring and the impeller through the suction holes along the suction pipe and the joint. The crescent-shaped part on the right side increases gradually from small volume due to the rotation of the impeller, thus producing vacuum suction gas. Water ring vacuum pump with the impeller rotation, gas into the left crescent-shaped part. Because the impeller rotates eccentrically, the space is gradually reduced, and the gas is gradually compressed and pressurized. The gas and water enter the water tank through the outlet hole through the joint along the exhaust pipe, and are separated automatically and then released by the exhaust pipe. Waste water and air in the water ring vacuum pump are discharged into the water tank together.

The main parts of light multistage centrifugal pump, such as impeller, guide vane, pump shaft and outer cylinder, are made of stainless steel. All the overflow parts of the series are made of stainless steel. They have good corrosion resistance. They are driven by carbide bearings and mechanical seals and rigid coupling. They are small in size, light in weight, corrosion resistant, small in vibration, low in noise, small in floor area and long in service life. Beautiful appearance and other characteristics, especially the advantages of high efficiency and energy saving. Separator level gauge. The liquid level in the separator can be observed. If the automatic control of the liquid level is needed, the liquid level meter with signal output, automatic overflow or rehydration device should be installed. Separator pressure gauge. If pressure may occur in the separator, pressure gauges should be installed on the separator. Thermometer. If it is necessary to observe the inlet temperature of working fluid, a thermometer should be installed in the working fluid pipeline. Working fluid booster pump. If the working fluid supply of the pump is insufficient or the resistance of the working pipeline is large, the working fluid booster pump can be installed. Working fluid control valve. If the supply of working fluid may be too large, the control valve should be installed in the working fluid pipeline. Cavitation protection pipeline. If the suction pressure of the vacuum pump is close to the working fluid when it is used as a compressor, the balance pipeline and the corresponding valve accessories should be installed between the suction and exhaust pipelines of the compressor.

AT/TC Series Cone Two Stage Water Ring Vacuum Pump

Cone Liquid Ring Vacuum Pump

Water ring vacuum pump

single stage rotary vane vacuum pump characteristics

Single-stage rotary vane vacuum pump oil-free (corrosion-resistant) vertical reciprocating vacuum pump is a replacement product of horizontal vacuum pump, and is the main equipment to obtain rough vacuum. The complete isolation of crankcase and cylinder is realized by using full sealing device, and advanced oil-free lubrication is realized by using self-lubricating material for piston rings. Because there is no sewage discharge, the vacuum pump is especially suitable for vacuum distillation, vacuum evaporation, vacuum drying, vacuum concentration and vacuum impregnation in chemical, pharmaceutical and food industries.

When running, driven by the motor, the piston in the cylinder moves to and fro through the action of crank-connecting rod mechanism (rotating motion into linear motion). When the piston moves from the left end to the right end in the cylinder, the pressure in the left chamber space decreases continuously as the volume of the left chamber of the cylinder increases. When the pressure in the left chamber space is lower than that in the pumped container, according to the principle of gas pressure balance, the gas in the pumped container is continuously pumped into the left chamber through the suction valve 5, which is in the process of suction. When the piston reaches its rightmost position, the left chamber of the cylinder is filled with gas. Then the piston moves from the right to the left, and the suction valve 5 closes automatically. Gas is gradually compressed as the piston moves from right to left. When the gas in the cylinder reaches the exhaust pressure, the exhaust valve 4 is opened and the gas is discharged, thus completing a working cycle. When the piston moves from the left end to the right end, repeat the above cycle until the pumped container reaches a certain equilibrium pressure.

Roots pump with relief valve is widely used in all aspects of vacuum acquisition. It extends the working range of oil-sealed mechanical vacuum pump under low inlet pressure. It has the characteristics of small volume and large pumping speed. It has large pumping speed in the range of 1-100pa inlet pressure. It is especially suitable for vacuum systems requiring large pumping speed under low inlet pressure, such as power transformer, power capacitor, etc. Vacuum drying, vacuum impregnation, vacuum heat treatment, vacuum smelting exhaust, vacuum coating equipment pre-pumping, large test wind tunnel exhaust and lighting production line exhaust, etc.

Rotary-vane-vacuum-pump-in-environmental-protection

Roots-Vacuum-Pump-Petrochemical-Industry

Liquid-Ring-Vacuum-Pump-for-Electric-Power-Industry